Ideally, surveys should be sufficiently brief to complete in one go, preferably in less than 30 minutes. That said, iSurvey does provide a Save and Quit function that enables participants to save their responses and then return to the survey later to complete some more. This feature is enabled by default, but can be turned off in Settings – Survey Options.
The Save and Quit button appears in the top right corner of each section screen, just below the University logo. Note that you don’t see it in either Preview mode.
When the user clicks it they sees an instruction like this:
And by following these instructions they will be able to resume the survey from where they quit. However, if they just close their browser then when they next access the survey link they will start from the beginning again. Their previous session will be just another incomplete data set. So you may need to add instructions about ‘Save and Quit’ in the welcome page.